Tailored Japanese Knotweed treatments for infestations across North West England

Based in North West England, Helmrig Ltd offer a range of Japanese Knotweed treatment options tailored to meet your specific needs.


Biological control or cutting

Japanese Knotweed has few if any natural enemies in this country and biological control could eventually become your preferred option. This method would control the plant but not eradicate it.

Regular cutting or pulling will eventually exhaust the plant into submission. However, the time scale, labour, and the cost make this method impractical in most cases.

The stem injection method

This Japanese Knotweed treatment method involves the team at Helmrig Ltd delivering a high dose of glyphosate-based herbicide directly into the Japanese Knotweed stem. This method is not weather dependent and directly targets the specific plant species without harming your surrounding plants. It is labour intensive as every single stem will need to be injected and is only suited to smaller infestations.


Herbicide spray treatments

The most common method we use is the application of herbicides which is effective treatment on larger areas of infestation as well as individual plants. This method offers the use of a broader range of potential herbicides though care should be taken, and you should seek the advice of one of our in house BASIS Qualified Advisor. This method of treatment should only be undertaken out by our NPTC qualified team.

Excavation & Removal

Where there is insufficient space or time to allow for on site treatment options it is possible to excavate and remove Japanese Knotweed material to licensed landfill facility. This is often referred to as ‘dig and dump’.

Many contractors will blindly quote the Environment Agency 7m X 3m guideline which will result in a huge volume of material being removed at great expense to the client whereas a considered approach and supervised excavation by experience personnel will chase the Knotweed plant out and can significantly reduce this volume sometimes by up to 90%.

Japanese Knotweed is a controlled waste and care should be taken that appointed contractors carry the appropriate waste carriers license and that waste transfer notification is provided showing the appropriate EWC code, site of origin, waste carrier, disposal facility and that the document is signed by the appropriate persons.

Excavation & Onsite storage

Where treatment cannot be carried out in situ due to the location of the infestation or the timescale of the development infestations are excavated and removed to an on site storage location for further treatment, usually by means of herbicide spraying. Once treated material can be utilised back into the site.
This treatment option adds additional cost to the standard herbicide spray treatment, however it often means development can continue unhindered providing there is sufficient room to store material within the site.

Excavation & Onsite Burial

Where sufficient storage areas are not available on site for on-going herbicide treatment it may be possible to create a burial cell. The cell is lined with a specialist geomembrane, such as Cutex into which the excavated Japanese Knotweed is placed and encapsulated.

This option requires excavation of a suitable cell area ideally away from areas of any future ground works or the locations of any services. Liaison with the local Environment Agency officer will also be required to ensure the material is suitable to be buried and the area plotted onto a site plan for future reference.

For advice on Japanese Knotweed treatment, call our expert team today

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